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Adjective back channel has 1 sense
  1. back-channel - via a back channel; "thefailure of back-channel negotiations"
,Noun back channel has 1 sense
  1. back channel - an alternative to the regular channels of communication that is used when agreements must be made secretly (especially in diplomacy or government); "they negotiated via a back channel"
    --1 is a kind of     channel, communication channel, line
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